The correct answer is "KIDNEY, URETER, BLADDER,KIDNEY URETER BLADDER". This answer is correct because it lists the organs in the correct order - kidney, ureter, bladder - and repeats the sequence again. The term "KUB" is an acronym for Kidney, Ureter, Bladder, which refers to a medical imaging procedure that focuses on these specific organs. Therefore, the answer accurately represents the meaning of "KUB".